Diaphragm pump



June 23, 1942. MALSBARY L 2,287,627

DIAPHRAGM PUMP Filed Jan. 23, 1940 INVENTORS? A t J08 F. MALSBA/PV. N (IWALTER m TAYLOR.

i in diaphragm inshock load. a I a t Further objectsand advantages ofour invention I r and the novel features thereof will be fully set forthin the claims hereto appended.

Patented June 23, 1 942 j UNITED STAT PATENT ;F1=ics DIAPHRAGM PUMP JobF. Malsbary and Walter W. Taylor, Oakland, Calif. i Y ApplicationJanuary 23,1940, Serial No..315 ,180

Claims. (cuts-n50)" The f present inve tion relates to improvementspumps,

t and its principal object is r to provide meansjfor equalizingorbalancing pressures active on the bearings for driving the pumpstroke, possibly threesixteenths of an inch; This gives the pumpmanyrapid pulsations with ficult for a bearing to copewith.

It isproposed therefore, in the present invenso-called shock loadinherent in power necessary to overcome the forces of inertia oli thechange in direction.

therefore. to provide described, which is pressures used on the powerstroke and inherent tapered housing section 4 housing by means otholtsportedthereon and a attached to the main connecting rod is secured, byany suitable m'eans,

such as the b01tl3 and washer I4, upon a diaphragm I 5 secured to theend of the housing 3 between aflange l6 onthe latter and a pump head l1,by means of bolts I 8. i 1

The pump, head ll forms. a pump chamber with the diaphragm and isprovided with suitable intakeand delivery valves l9 and 20."

This pump is intended to operate at high speed, and itis apparent thatinnormal operation, the

bearing l2 nterposed between the cam [B and adapted t absorbsubstantially one-half of the l The preferred form of our invention isillusaccompanying drawing, in which: Figure 1 shows a vertical sectionthrough our pump, and

Figure 2, a. horizontal section taken along line .2-2ofFigure 1'. r

e we have shown only the preferred form invention, we wish tachedwithout departing from the spirit of the invention.

Referring to the drawing in detail, we show a substantially conventionaldiaphragm pump i comprising a base2, a cylindrical housing 3 sup.-

will he comparatively light, whereas the pressure inner section 22 ofthe bearing isv exerted on the relatively strong.

In actual operation, it happens,

'ing is shortened, and the'operation of the pump is rendered lessefficient;

To overcome this defect, we have thought of suhstituting a largerhearing, but

The tension of the spring 23 may be adjusted by turning the screw 21,and should preferably be such as to substantially absorb one-half of thediflerential in pressure between the suction and power strokes, so as tosubtantially balance the pressures on the bearing.

For this purpose, the spring should absorb somewhat more than one-halfof the actual pump pressure to take care of additional pressure producedby or inherent in the reversal of movement of the connecting rod.

For instance, when the pump is pumping at a pressure equal of, say; onehundred pounds to the square inch, the spring should be loaded to apressure of at least fifty pounds, and possibly to seventy-five pounds.The addition of twentyfive pounds would be intended to take up part ofthe so-called shock. load inherent in the reversal in direction of theconnecting rod.

As a general rule, we would consider that the spring should carrypossibly three-fourths of the static pressure against the diaphragm sideof the pump.

The pump housing, as shown, is preferably made in two separable sectionsfor facilitating the assembling of the pump and the spring, and a drainhole 28 is provided near the diaphragm to prevent water from reachingthe bearing in case of leaks.

Theoperation and advantages of the invention will be readily understoodfrom the foregoing description:

On the suction stroke the cam l bearing on the portion 2| of the bearingplaces the spring 23 under tension,- and this tension is released whenthe cam l0 begins the compression stroke, so that during the latter, thespring 23 assumes part of the burden and thereby relieves the section 22of the bearing to a corresponding degree. I

Thus both sides of the hearing will substantially carry the same loadand no portion of the bearing will be subjected to excessive wear.

The action of the pump itself is much improved, and becomes smooth andvelvety, insuring better and more perfect operation and longer life.

We claim:

1. In a diaphragm pump, a housing having a diaphragm supported in oneend thereof, a rotary shaft transversely supported in an intermediatesection of a housing and having a cam thereon, an abutment in the otherend of the housing, a connecting rod having one end connected to thediaphragm having an annular bearing on the other end fitted over the camto gyrate therewith when the cam is rotated for reciprocating thediaphragm, a seat formed on the extreme bearing end of the connectingrod opposite the diaphragm, and a spring having its outer end bearing onthe abutment and its inner end bearing on the seat to gyrate with thebearing, the spring serving to equalize pressures on the bearing duringcompression and suction strokes and the seat having means for holdingthe spring end against lateral slipping.

2. In a diaphragm pump, a housing having a diaphragm supported in oneend thereof, s. rotary shaft transversely supported in an intermediatesection of the housing and having a cam thereon, an abutment in theother end of the housing, a connecting rod having one end connected tothe diaphragm and having an annular bearing on the other end fitted overthe cam to gyrate therewith when the cam is rotated for reciprocatingthe diaphragm, a seat formed on the extreme bearing end of theconnecting rod opposite the diaphragm, and a spring having its outer endbearing on the abutment and its inner end bearing on the seat to gyratewith the hearing, the spring serving to equalize pressures on thebearing during compression and suction strokes, the abutment havingmeans for adjusting the position thereof whereby the tension of thespring may be adjusted and the seat having means for holding the end ofthe spring against lateral slipping.

3. In a diaphragm pump, a housing having a diaphragm supported in oneend thereof, a rotary shaft transversely supported in an intermediatesection 0-. the housing and having a cam thereon, an abutment in theother end of the housing, a connecting rod having one end connected tothe diaphragm and having an annular bearing on the other end fitted overthe cam to gyrate therewith when the cam is rotated for reciprocatingthe diaphragm, a seat-formed on the extreme bearing end of theconnecting rod opposite the diaphragm, and a spring-having its outer endbearing on the abutment and its inner end bearing on the seat to gyratewith the bearing, the spring serving to equalize pressures on thebearing during compression and suction strokes, the seat having meansfor holding the end of the spring against lateral slipping and thehousing being split transversely in two sections of substantially equallength Joined togather at the location of the shaft for facilitating theassembling of the pump.

4. A connecting rod for a pump or the like comprising a shank, anannular bearing on one end thereof, an annular, fiat seat formed uponthe latter end outside the bearing and in a plane at a right angle tothe shank, and a central cylindrical projection rising from the end ofthe shank inside of the seat for defining the inner limit thereof.

5. In combination, a connecting rod for a pump or the like comprising ashank having an annular bearing on one end thereof and having a seatformed upon said end, means for revolving the bearing whereby the endoi. the shank is made to gyrate, an abutment opposite the seat and aspring mounted between the seat and the abutment and made to gyrate withthe shank end for balancing pressures active on the connecting rod.

JOB F. MALSBARY. WALTER W. TAYLOR.

